A patient with a history of open reduction and internal fixation (ORIF) of the patella presents with lateral knee pain; what is the most likely cause and recommended management?

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Lateral Knee Pain After Patellar ORIF: Most Likely Cause and Management

In a patient with prior patellar ORIF presenting with lateral knee pain, the most likely cause is lateral patellofemoral impingement from hardware prominence, maltracking, or soft tissue irritation, and management should begin with targeted physical examination of the lateral facet followed by imaging and consideration of lateral release or hardware removal if conservative measures fail.

Most Likely Causes

Hardware-Related Complications

The primary concern in post-ORIF patients is hardware prominence or irritation causing lateral patellofemoral impingement. This occurs when:

  • Tension band wiring or screws protrude laterally
  • Malunion alters patellar tracking mechanics
  • Scar tissue forms around hardware creating impingement 1

Patellofemoral Maltracking

Post-surgical changes can disrupt normal patellar mechanics:

  • Altered Q-angle from surgical approach
  • Lateral retinacular tightness from scarring
  • Quadriceps weakness causing lateral patellar drift 2

Post-Traumatic Patellofemoral Pain

Even with successful fracture healing, patients may develop chronic patellofemoral pain syndrome from:

  • Articular cartilage damage at injury
  • Altered biomechanics post-fixation
  • Persistent quadriceps inhibition 3

Diagnostic Approach

Physical Examination Specifics

  • Direct palpation of the lateral patellar facet for tenderness (key finding for impingement) 2
  • Assess patellar tracking during active knee extension (observe for lateral deviation)
  • Measure quadriceps circumference bilaterally (>1.5 cm difference suggests significant atrophy) 4
  • Test for lateral patellar tilt and apprehension
  • Palpate hardware for prominence

Imaging Protocol

Following ACR guidelines for chronic knee pain 5:

  1. Start with radiographs (AP, lateral, and sunrise/Merchant view mandatory):

    • Sunrise view specifically evaluates lateral patellofemoral alignment 2
    • Assess hardware position and fracture union
    • Look for lateral osteophyte formation

  2. MRI without contrast if radiographs are unrevealing:

    • Identifies lateral synovial fold hypertrophy
    • Detects bone marrow edema patterns
    • Evaluates cartilage integrity 5

  3. Diagnostic intra-articular lidocaine injection:

    • Immediate pain relief confirms intra-articular source 6
    • Guides decision for arthroscopic intervention

Management Algorithm

Conservative Management (First-Line)

Based on 2024 best practice guidelines 3 and 2018 consensus 7:

Exercise therapy is mandatory and should include:

  • Combined hip and knee strengthening (superior to knee-only exercises)
  • Focus on quadriceps strengthening to restore tracking
  • Hip abductor/external rotator strengthening to control femoral rotation
  • Progress from isometric to closed-chain exercises 8

Adjunctive interventions to consider:

  • Prefabricated foot orthoses (evidence-supported for pain reduction) 7
  • Patellar taping for symptom relief during rehabilitation
  • Manual therapy targeting lateral retinacular restrictions
  • Movement retraining to optimize patellofemoral mechanics 3

Education must underpin all interventions:

  • Explain pain mechanisms (not structural damage)
  • Set realistic expectations (symptoms may persist 20+ weeks) 8
  • Emphasize activity modification, not avoidance

Surgical Management (If Conservative Fails)

Indications for surgery:

  • Persistent pain >3-6 months despite optimal rehabilitation
  • Confirmed lateral impingement on examination and imaging
  • Hardware prominence or malunion

Surgical options:

  1. Lateral facetectomy for bony impingement 2
  2. Hardware removal if prominent or symptomatic 1
  3. Lateral retinacular release for soft tissue impingement
  4. Arthroscopic synovial fold resection if hypertrophic fold identified 6

Studies show significant improvement in Knee Society scores at 8 weeks, 16 weeks, and 1 year following lateral facetectomy for impingement 2.

Critical Pitfalls to Avoid

  1. Don't skip the sunrise view radiograph - this is essential for diagnosing lateral patellofemoral pathology and is often omitted 2

  2. Don't order MRI prematurely - approximately 20% of chronic knee pain patients undergo MRI without recent radiographs, wasting resources 5

  3. Don't attribute all pain to hardware - many patients have functional patellofemoral pain that responds to exercise therapy without hardware removal 3

  4. Don't neglect hip strengthening - isolated knee exercises are inferior to combined hip-knee programs 7, 3

  5. Don't expect rapid resolution - even with optimal treatment, modest pain and strength asymmetry commonly persist beyond 20 weeks 8

Expected Outcomes

With appropriate management:

  • Range of motion typically improves to 120-145° by 15-20 weeks 4, 8
  • Lysholm scores average 94.4 points (excellent outcome) 4
  • Thigh circumference difference should be <1.5 cm 4
  • Pain scores (VAS) should decrease to 0-2/10 8, 4

Patients should be counseled that intermittent stiffness and mild activity-related pain may persist even with successful treatment 8.

References

4
Research

Open reduction and internal fixation of comminuted patellar fractures with headless compression screws and wiring technique.

Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association, 2018

5
Guideline

acr appropriateness criteria<sup>®</sup> chronic knee pain.

Journal of the American College of Radiology, 2018

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.